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对二元混合物来说,如果各组成成分中某种元素的质量分数不相同,而当混合物中该元素的质量分数为确定值时,则两种组成成分的
For a binary mixture, if the mass fraction of an element in the components is not the same, and when the mass fraction of the element in the mixture is a definite value, the two components are